Sunday, November 29, 2015

Houay Lamphan Gnai, yet another hydropower plant just started commercial operations recently
with a reservoir area of seven square kilometers as reported by local media. Time to put it
on OpenStreetMap using up-to-date Landsat 8 imagery and the new
GRASS GIS 7 plugin for
QGIS 2.12. To get familiar with GRASS GIS'
interface to numpy,
I've decided to extract the reservoir using numpy.

Thursday, August 14, 2014

From time to time I have the chance to work with PyCairo, the Python bindings to the cairo graphic library. I appreciate this library because it allows to draw graphics primitives so super fast and thus it is very suitable to use it in web projects.
After my trials with GRASS GIS as WMS backend I thought I could create a raster web map service with improved performance by using PyCairo instead of GRASS GIS as renderer.

Tuesday, July 22, 2014

Inspired by severalposts which explain MapBox' marvellous Cloudless Atlas, I wanted to imitate a cloudless atlas by myself. Limited in time and computer power I had to do it much simpler of course. But using first class spatial Python libraries I could achieve quite nice results with a simple Python script.